Defensive publication



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at therequest of the applicant or owner in accordance with the Notice of Dec.16, 1969, 869 0.G. 687. The abstracts of Defensive Publicationapplications are identified by distinctly numbered series and arearranged chronologically. The heading of each abstract indicates thenumber of pages of specification, including claims and sheets ofdrawings contained in the application as originally filed. The files ofthese applications are available to the public for inspection andreproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to themerits of alleged invention. The Patent Oflice makes no assertion as tothe novelty of the disclosed subject matter.

PUBLISHED FEBRUARY 24, 1970 T871,008 FIBER-FORMING POLYESTERCOMPOSITIONS HAVING IMPROVED SPINNABILITY William M. McSpadden, Jr.,P.0. Box 511, Kingsport, Tenn. 37662 Continuation of application Ser.No. 707,986, Feb. 26,

1968. This application Sept. 24, 1969, Ser. No. 860,839

Int. Cl. C08g 17/00, 39/02 US. Cl. 260-22 No Drawing. 11 PagesSpecification Fiber-forming polyester compositions having improvedspinnability are obtained by incorporating about 0.01- 1.00% by weightof certain spinning additives therein. The resulting composition may beconventionally meltspun into filaments with reduced slubbing. Thespinning additives considered effective for this purpose include alkylstearates (such as methyl stearate), pentaerythritol tetrastearate,polyoxyethylene fatty alcohols, alkali metal di- (alkyl) phosphates(such as sodium di(2-ethyl-hexyl) phosphate), calcium stearate, alkalimetal stearates and dialkyl silox-anes. The fiber-forming polyesterswith which this invention is concerned are those derived from at leastone difunctional dihydroxy compound (such as a difunctional diol) and atleast one difunctional dicarboxylic acid. Preferred polyesters arepoly(ethylene-terephthalate) and those derived from1,4-cyclohexanedimethanol and terephthalic or isophthalate acid. Othermaterials, such as pigments (such as TiO brighteners (such as2,2'-(vinylenedi-p-phenylene)bisbenzoxazole), stabilizers, fillers,inhibitors, processing agents, and the like, which are conventionallyadded to the polyester melt prior to spinning may also be introducedinto the polyester melt either before, after, or at the same time as thespinning additives. The spinning additives as well as any otheradditives should be substantially dry before being introduced to thepolyester melt.

